Ring bit



FIG. 1 is a first end view of the design;

FIG. 2 is a second end view of the design;

FIG. 3 is a perspective view of the design;

FIG. 4 is another perspective view of the design;

FIG. 5 is another perspective view of the design; and,

FIG. 6 is a side view of the design.

The broken lines shown in the drawings represent environment and form no part of the claimed design. 

CLAIM The ornamental design for a ring bit, as shown and described. 